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Thyristors

Thyristors are four-layer semiconductor devices, also known as a silicon controlled rectifier (SCR) It is like a fast static switch and is good for controlling large amounts of power, they can also control the speed of DC motors. You can learn more in our complete guide to thyristors.

How do thyristors work?

Thyristors usually consist of three electrodes: an anode (positive terminal), Cathode (negative terminal) and a gate. (You can also get thyristors with two or four leads). The gate is the main control terminal while the main current flows between the anode and cathode Thyristors are made of N-type and P-type materials. The N-type material is formed by doping an element with electrons to increase the number of negative charge-carrying electrons. The P-type material is also produced through doping, although the resulting charge-carrying electrons are positively charged. By alternating layers of P and N-type material, a semiconductor thyristor device is formed. Thyristors are used to create a latching circuit. Thyristors can be turned on using the gate. It then turns off when the voltage across the anode-cathode drops back down to zero.

Types of thyristors

Silicon controlled rectifier (SCR) - The basic purpose of an SCR is to function as a switch that can turn on or off small or large amounts of power.
Silicon controlled switch (SCS) - Silicon Controlled Switch (SCS) is a device similar to an SCR, but it is designed to turn off when a positive voltage/input current pulse is applied to an additional "Anode gate".
Triac - Triac gets its name from Triode for alternating current Triacs are similar to SCRs but it conducts in both directions, (a bidirectional device). This means that it can switch AC and DC currents., Firing circuit commander modules are required for this.
Four-layer diode - A four-layer diode has 2 pins and is similar to a voltage-sensitive switch. When the voltage between the two pins exceeds the breakdown voltage it turns ON, otherwise its OFF.
Diac - Diac is a mix of the words diode and ac switch it is similar to a four-layer diode but it can conduct in both directions meaning it can contact both AC and DC currents.

Applications of thyristors

Thyristors are commonly found in many everyday applications such as:

Motor speed controls
Pressure control systems
Light dimmers
Liquid level regulators

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In Stock Semikron Danfoss SKKT 57/16 E, Dual Thyristor Module 1600 V, 50 A 150 mA 1.5 kA 1.65 V RS Stock No. 905-6106 Mfr. Part No. SKKT 57/16 E Subtotal (1 unit) $57.67(exc. GST) $57.67/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	50A	A-46	SCR	-	1600V	-	1.5kA	Panel	-	-	-	150mA	-	-	-	-	-	7	3V	250mA	-40°C	125°C	-	-	-	No	-	-
In Stock Semikron Danfoss SKCH 28/12, Controllable Bridge Rectifier 1200 V, 30 A 100 mA 0.32 kA 2.25 V RS Stock No. 183-2268 Mfr. Part No. SKCH 28/12 Subtotal (1 unit) $81.35(exc. GST) $81.35/unit Quantity	Semikron Danfoss	Controllable Bridge Rectifier	-	30A	SEMIPONT1	SCR	-	1200V	-	0.32kA	Surface	-	-	-	100mA	-	-	-	-	-	9	2V	150mA	-40°C	125°C	-	-	-	No	-	-
In Stock Semikron Danfoss SKKT 92/16 E, Dual Thyristor Module 1600 V, 100 A 150 mA 2.5 kA 1.35 V RS Stock No. 905-6128 Mfr. Part No. SKKT 92/16 E Subtotal (1 unit) $66.23(exc. GST) $66.23/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	100A	A-10	SCR	-	1600V	-	2.5kA	Panel	-	-	-	150mA	-	-	-	-	-	3	3V	250mA	-40°C	125°C	-	-	-	No	-	-
In Stock United Automation PAC-2, Phase Angle Power Control Module, 25 A 250 A RS Stock No. 379-6518 Mfr. Part No. PAC-2 Subtotal (1 unit) $122.88(exc. GST) $122.88/unit Quantity	United Automation	Phase Angle Power Control Module	-	25A	-	-	-	-	-	250A	Surface	-	-	-	-	-	-	-	-	-	-	-	-	-	65°C	-	-	PAC2	I.E.T. Regulations (BS7671)	-	-
In Stock IXYS, Dual Thyristor Module 1200 V 2.4 kA, 116 A 150 mA 1.5 V TO-240AA 7-Pin RS Stock No. 668-7029 Mfr. Part No. MCC95-12io1B Subtotal (1 unit) $70.03(exc. GST) $70.03/unit Quantity	IXYS	Dual Thyristor Module	-	116A	TO-240AA	-	-	1200V	-	2.4kA	Panel	-	-	-	150mA	-	-	-	-	-	7	2.5V	200mA	-	125°C	30mm	92mm	-	No	-	-
In Stock United Automation TPSR-25, Variable AC Voltage Regulator Modular Power Controller, 25 A 250 A RS Stock No. 841-930 Mfr. Part No. TPSR-25 Subtotal (1 unit) $103.64(exc. GST) $103.64/unit Quantity	United Automation	Variable AC Voltage Regulator Modular Power Controller	-	25A	-	-	-	-	-	250A	-	-	-	-	-	-	-	-	-	-	-	-	-	0°C	65°C	-	-	TPSR	I.E.T. Regulations (BS7671)	-	-
Limited stock Littelfuse 2N6507G, Thyristor 400 V, 16 A 30 mA 250 A 1.8 V RS Stock No. 544-9999 Mfr. Part No. 2N6507G Subtotal (1 unit) $6.27(exc. GST) $6.27/unit Quantity	Littelfuse	Thyristor	-	16A	TO-220	SCR	-	400V	-	250A	Through Hole	-	-	-	30mA	-	-	-	-	-	3	1.5V	40mA	-40°C	125°C	-	-	2N650x	No	-	-
In Stock Infineon TT120N16SOFHPSA1, Thyristor Module 1600 V 2250 A, 120 A 100 mA 1.75 V 7-Pin RS Stock No. 217-7225 Mfr. Part No. TT120N16SOFHPSA1 Subtotal (1 unit) $56.12(exc. GST) $56.12/unit Quantity	Infineon	Thyristor Module	-	120A	-	-	-	1600V	-	2250A	-	-	-	-	100mA	-	-	-	-	-	7	2.5V	250mA	-	130°C	-	-	TT120N16SOF	No	-	-
In Stock Vishay VS-40TPS08-M3, Thyristor 800 V, 35 A 150 mA 600 A 1.85 V RS Stock No. 167-314 Mfr. Part No. VS-40TPS08-M3 Subtotal (1 unit) $12.70(exc. GST) $12.70/unit Quantity	Vishay	Thyristor	-	35A	TO-247	SCR	-	800V	-	600A	Through Hole	-	-	-	150mA	-	-	-	-	-	3	2.5V	150mA	-40°C	125°C	-	-	VS-40TPS-M3	No	-	-
In Stock Vishay VS-40TPS12A-M3, Thyristor 1200 V, 35 A 40 mA 600 A 1.85 V RS Stock No. 301-619 Mfr. Part No. VS-40TPS12A-M3 Subtotal (1 unit) $14.87(exc. GST) $14.87/unit Quantity	Vishay	Thyristor	-	35A	TO-247	SCR	-	1200V	-	600A	Through Hole	-	-	-	40mA	-	-	-	-	-	3	2.5V	150mA	-40°C	125°C	-	-	VS-40TPS-M3	No	-	-
In Stock United Automation QLC-TB-RFI, AC Regulator with RFI Suppression, 17 A 250 A RS Stock No. 214-3957 Mfr. Part No. QLC-TB-RFI Subtotal (1 unit) $163.34(exc. GST) $163.34/unit Quantity	United Automation	AC Regulator with RFI Suppression	-	17A	-	TRIAC	-	-	-	250A	-	-	-	-	-	-	-	-	-	-	-	-	-	-	70°C	-	-	-	Low Voltage Directive (LVD), EMC Directive, I.E.T. Regulations (BS7671)	-	-
Currently unavailable IXYS, Thyristor 1600 V, 48 A 200 mA 560 A 1.64 V RS Stock No. 761-4003P Mfr. Part No. CS45-16io1R Subtotal 1 unit (supplied in a tube) $12.48(exc. GST) $12.48/unit Quantity	IXYS	Thyristor	-	48A	ISOPLUS247	SCR	-	1600V	-	560A	Through Hole	-	-	-	200mA	-	-	-	-	-	3	1.6V	100mA	-40°C	140°C	-	-	-	No	-	-
In Stock United Automation MAT, Thyristor Trigger Module RS Stock No. 489-3480 Mfr. Part No. MAT Subtotal (1 unit) $78.09(exc. GST) $78.09/unit Quantity	United Automation	Thyristor Trigger Module	-	-	-	-	-	-	-	-	Panel	-	-	-	-	-	-	-	-	-	-	-	-	-	65°C	-	42mm	MAT	BS 7671	-	-
In Stock Infineon, Thyristor Module 1600 V 2250 A, 120 A 100 mA 1.75 V 7-Pin RS Stock No. 217-7225P Mfr. Part No. TT120N16SOFHPSA1 Subtotal 1 unit (supplied in a tray) $51.40(exc. GST) $51.40/unit Quantity	Infineon	Thyristor Module	-	120A	-	-	-	1600V	-	2250A	-	-	-	-	100mA	-	-	-	-	-	7	2.5V	250mA	-	130°C	-	-	TT120N16SOF	No	-	-
In Stock Vishay VS-40TPS12-M3, Thyristor 1200 V, 35 A 150 mA 600 A 1.85 V RS Stock No. 167-320 Mfr. Part No. VS-40TPS12-M3 Subtotal (1 unit) $15.37(exc. GST) $15.37/unit Quantity	Vishay	Thyristor	-	35A	TO-247	SCR	-	1200V	-	600A	Through Hole	-	-	-	150mA	-	-	-	-	-	3	2.5V	150mA	-40°C	125°C	-	-	VS-40TPS-M3	No	-	-
In Stock United Automation PR1-DIN-2.5KW, Heater Battery Controller, 10.9 A RS Stock No. 493-077 Mfr. Part No. PR1-DIN-2.5KW Subtotal (1 unit) $199.83(exc. GST) $199.83/unit Quantity	United Automation	Heater Battery Controller	-	10.9A	-	Burst Fire	-	-	-	-	DIN Rail	-	-	-	-	-	-	-	-	-	-	-	-	-	65°C	-	-	PR1-DIN	CE	-	-
In Stock Vishay VS-T90RIA120, Thyristor 1200 V, 90 A 120 mA 1.87 kA 1.55 V RS Stock No. 379-8031 Mfr. Part No. VS-T90RIA120 Subtotal (1 unit) $67.62(exc. GST) $67.62/unit Quantity	Vishay	Thyristor	-	90A	D-55	SCR	-	1200V	-	1.87kA	Panel	-	-	-	120mA	-	-	-	-	-	3	2.5V	200mA	-40°C	125°C	-	-	VS-T.RIA	No	-	-
Unavailable Vishay, VS-VSKT41/16, Dual Thyristor Module, SCR, 60A 1600V, 7-Pin TO-240AA RS Stock No. 700-5099P Mfr. Part No. VSKT41/16 Subtotal 1 unit (supplied in a bag) $58.94(exc. GST) $58.94/unit Quantity	Vishay	-	60A	-	TO-240AA	SCR	1600V	-	-	1.2kA	-	Panel Mount	-	270mA	-	-	-	4V	-	200mA	7	-	-	-40 °C	+125 °C	-	-	-	-	-	92 x 22.6 x 30mm
Temporarily out of stock Infineon TD120N16SOFHPSA1, Thyristor Module 1600 V 2250 A, 120 A 100 mA 1.75 V 7-Pin RS Stock No. 217-7205 Mfr. Part No. TD120N16SOFHPSA1 Subtotal (1 unit) $53.28(exc. GST) $53.28/unit Quantity	Infineon	Thyristor Module	-	120A	-	-	-	1600V	-	2250A	-	-	-	-	100mA	-	-	-	-	-	7	2.5V	250mA	-	130°C	-	-	-	No	-	-
In Stock IXYS, Dual Thyristor Module 1600 V 9.6 kA, 250 A 150 mA 1.36 V 7-Pin RS Stock No. 168-4477 Mfr. Part No. MCC255-16IO1 Subtotal (1 box of 3 units) $1,015.689(exc. GST) $338.563/unit Quantity	IXYS	Dual Thyristor Module	-	250A	-	-	-	1600V	-	9.6kA	Panel	-	-	-	150mA	-	-	-	-	-	7	2V	150mA	-	130°C	49mm	115mm	-	No	-	-